Calamagrostis ophitidis is a species of grass known by the common name serpentine reedgrass. It is endemic to California, where it grows in the serpentine soils of the mountain slopes north of the San Francisco Bay Area. It is a perennial grass forming clumps reaching heights between 60 centimeters and one meter. The flower cluster is a dense, thinly bushy array of rough, pale-colored spikelets.
Calamagrostis ophitidis
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